Provide a variety of air quality monitoring system with high precision and easy to use. Products are widely used in construction sites, mines, iron and steel, power plants, chemical manufacturing, health supervision, environmental protection, environmental online monitoring and other fields. Their test indicators include dust concentration, noise, temperature and humidity, atmospheric pressure, wind speed and direction, PM1 0、PM2. 5、PM10. 0. TSP, CO, SO2, NO2, O3, TVOC, etc.